RANDY SUN Crew Waterproof Socks, Mens' Breathable Skiing Socks Black&Light Purple Size Medium 1-Pair Outer: 74% high waterproof nylon, 23% lycra,3% elastane, Interlayer: a high performance lightweight function of waterproof and breathable membrane, Lining: 64% coolmax,3% lycra,33% elastane RANDY SUNS DIFFERENCE: RANDY SUNs Unisex Waterproof Hiking Skiing Socks is a new patent product that has been certified by SGS Corporation.100% Waterproof, 100% Inspection and 100% Seamless. The high waterproof and breathable fabric prevents the external water molecules from entering socks and meanwhile absorbing sweat rapidly produced in the movement process. Our Waterproof Socks has become the top choice for outdoor enthusiasts, military personnel as well as postal clerks. UNIQUE DESIGN: RANDY SUNs 100% Waterproof Hiking Socks are designed with a three-layer knitting construction, which handily solves the contradiction between Waterproofing and Breathing properties. OUTER LAYER: 74% high waterproof nylon, 23% lycra, 3% elastane; INTER LAYER: High performance lightweight fabric with breathable and waterproof membrane; LINING: 64% coolmax, 3% lycra, 33% elastane. The Mid-Calf Water Resistant Socks are available in a wide range of nice colors and novelty patterns. NOTE: Our Waterproof Breathable Hiking Socks with a three-layer knitting construction are about 2 or 3 times thicker than normal socks, so it might be a little difficult to stuff into some well-fitting shoes. Please match with Loose Fit Shoes. FOUR SIZES: Extra Small Size - fit for US men 4.5-6.5;women 5.5-7.5; Small Size - men 7-9;women 8-10.5; Medium Size - men 9.5-12;women 11-13; Large Size -men 12.5-14.5;women 13.5-15.5. Please refer to images on the left for more detailed size information. RANDY SUN's Difference: 100% waterproof and breathable, moisture and perspiration absorption. The high waterproof fabric prevents the external water molecules into socks, meanwhile spreads feet sweat quickly to the outside of the socks. Function: Our socks water resistant is great to use as running socks, cycling socks, climbing socks, skiing socks, etc. It is suitable for outdoor sports and activities of various kinds of harsh environments. It is a good choice to do outdoor sports with our waterproof socks and the waterproof speakers http://a.co/9NHSSKO.